Hot-air furnace



(.NoMbdeL) G. L. NIEHAUS.

HOT AIR FURNACE.

Patented Sept. 28, 1886 Lil UNITED STATES PATENT Fines.

GEORGE L. NIEHAUS, OF ST. LOUIS, MISSOURI.

HOT-AIR FURNACE.

SPECIFICATION forming part of Letters Patent No. 350,076, dated September 28. 1886.

(N O model.)

To aZZ whom it may concern:

Be it known that I, GnoRoE L. Nrnnrns, of the city of St. Louis, in the State of Missouri, have invented a certain new and useful Improvement in Hot Air Furnaces, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification, and in which Figure 1 is one-half in front elevation and one-half in vertical section at 11. 1, Fig. 2, with the outer casing removed. Fig. 2 is a vertical section at 2 2, Fig. 1. Fig. 3 is a horizontal section at 3 3, Fig. 1, part being broken away.

This furnace belongs to that class in which the smoke may be allowed to escape directly to the chimney, or may be caused to pass through a drum around which the air circulates, the air also passing upward through pipes traversing the drum.

A is the tire-pot.

B is the grate, pivoted at the center to a spider-frame, C.

D is a handle by which the grate may be shaken.

E is the ash-pit, having a door, F, with a register, G, as usual.

The fuel is fed through a mouth, ll, having a door, I, with a register, J.

K is an exit-passage in the top of the firepot, which leads directly into the horizontal tine L. K is a damper in the passage K, and K is a handle extending through the casing, by which the damper may be turned. This line L is shown extending diametrically through the apparatus. The end Z has a register, L, and communicates with the outer air. The end Z of the flue L connnunicates with the chimney. From the middle of the flue L ascends a vertical flue, M.

N is an annular flange extending outwardly and downwardly from the top of the upright flue M.

O is a neck extending from the top of the fire-pot and in communication with the iire chamber by an annular passage, 1?, surrounding the passage K. \Vhcn the damper K of the passage K is closed, the whole of the products pass through the annular passage P and the neck 0 into the drum Q. As the products of combustion ascend from the neck, they impinge against the deflecting-flange N and diverge to the outer parts of the drum, and

finally have exit downward through the flue M and the discharging end 7, of the line L.

R are a number of yerticalaiupipes extending through the drum from bottom to top. The air to be heated enters the orifice S between t-he aslrpit and the casing T, and passes upward between the casing and the fire-pot. the. neck 0, and around the drum Q, and through the air-pipes It in the drum, and over the drum to the exit pipe or pipes U, leading to the rooms to be heated. It will be seen that the casing T incloscs the ash-pit, fire-pot, neck 0, and drum Q,

The operation of the apparatus is as follows: When the tire is first started, the damper K is open, and the smoke passes directly from the fire-chamber into the fine L and the ehimney. After the fire begins to burn freely the damper 11 may be partly or wholly closed, and then the products of combustion will pass into the drum and escape through the vertical flue H and horizontal flue L into the chimney. \Vhen it is desired to lessen the heat of the furnace, the registers J and L may be opened and the register G- elosed to a greater or less extent.

The flue L is described and shown as passing transversely through the apparatus; but this is not essential, as the parts each side of the passage K may be set at an angle to each other without materially affecting the action of the line.

I claim as my invention- 1. The combination, with the ilre chamber and the radiating-drum, of a flue communieating at one end with the sinoke-Ilue and at the other with the external atmosphere, a valve for controlling the latter communication, and a branch flue extending from the flue first named into the .radiating-drum, substantially as and for the purpose set forth.

2. The combination, in a hot-air furnace,'of a fire-chamber, passage K, with damper K, neck 0, drum Q, flues L and M, and deflector N, substantially as set forth.

3. The combination, with the fire-chamber and the mdiating-drum having communica tion therewith, ofa line having communication with the said drum, fire-chamber, and the external atmos mere, and dampers 'l'or controt ling the two latter communications, substan- K L, for controlling the two last-named comtially as set forth. munications, substantially as and for the pur- 1o 4. The combination, with the fire-chamber, pose set forth.

of a flue having communication with the smoke 5 flue, an aperture, K, through which it communicates with the fire-chamber, and an open- In presence of ing, Z, through which it communicates with the SAML. KNIGHT,

external atmosphere, and valves or dampers BENJN. A. KNIGHT. 

